A pair of strong over the counter reading glasses, I have a pair of 3.5 dioptre, my eyes about 1.25d, and the desk lamp you possibly already have is more economical. Can't see spending $352 on a magnifier lamp which are often awkward to use and get in the way when a pair, or two, of strong reading glasses at $10/pair will do the trick. A small flexi halogen lamp easy to find for $20-30.